How to add features the "native" way

[Genteure]

No promise on whether it'll actually be done, but I'm experimenting with adding a best-effort mostly-spec-compliant fetch API to Jint.
I want to write everything the "native" way, instead of using Interop or evaluating javascript strings. So ThingConstructor ThingInstance ThingPrototype just like types under Jint.Native.

I experimented with it being an opt-in feature in Jint itself and a standalone project.

For the standalone project:

• Constructing new object uses OrdinaryCreateFromConstructor but it's set to internal
• Prototype needs a Realm but it's set to internal on Engine (changed in Remove Engine.Realm, expose Engine.Intrinsics and Engine.Global directly #1722 )

The obvious answer to me is just make them public/remove requirement on Realm. Is there anything else I'm missing?

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Off topic to the title, I'm slightly leaning towards implementing fetch in Jint as an opt-in feature even if implementing it externally is possible. Would such changes be accepted into the project? Assuming it's implemented well enough, of course.

From #1999 (comment) I'm assuming it's probably yes, but I'd love to hear some opinions.